Which statement is a true feature of cohort studies?

Which statement is a true feature of cohort studies?

• A. True
• B. False
• C. Only for cross-sectional
• D. Not applicable

Answer: (A)

Cohort studies are defined by following a group of individuals over time to see who develops the outcome, based on their exposure status. This design provides temporality—the exposure is known to precede the outcome—and allows direct estimation of incidence and relative risk by comparing the rate of the outcome in exposed versus unexposed groups. They can be prospective or retrospective, and you can examine multiple outcomes from the same exposure. This makes temporality and incidence estimation true features of cohort studies, which is why this statement is correct. In contrast, cross-sectional designs assess exposure and outcome at one point in time and cannot establish temporality, so they aren’t the defining feature of cohort studies.

Cohort studies are defined by following a group of individuals over time to see who develops the outcome, based on their exposure status. This design provides temporality—the exposure is known to precede the outcome—and allows direct estimation of incidence and relative risk by comparing the rate of the outcome in exposed versus unexposed groups. They can be prospective or retrospective, and you can examine multiple outcomes from the same exposure. This makes temporality and incidence estimation true features of cohort studies, which is why this statement is correct. In contrast, cross-sectional designs assess exposure and outcome at one point in time and cannot establish temporality, so they aren’t the defining feature of cohort studies.